| 7.5 mm MAS |
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| Type | Rifle |
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| Place of origin | France |
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|
| Used by | France |
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| Produced | 1924 to 1929 |
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|
| Parent case | 6.5×55mm |
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| Case type | Rimless, bottleneck |
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| Bullet diameter | 7.8 mm (0.31 in) |
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| Neck diameter | 8.6 mm (0.34 in) |
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| Shoulder diameter | 11.2 mm (0.44 in) |
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| Base diameter | 12.2 mm (0.48 in) |
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| Rim diameter | 12.2 mm (0.48 in) |
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| Rim thickness | 1.4 mm (0.055 in) |
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| Case length | 57.6 mm (2.27 in) |
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The 7.5×57mm MAS or 7.5×58mm mle 1924c was a short-lived French rifle cartridge that was introduced in the mid-1920s to replace the 8×50mmR Lebel, although it itself was soon replaced with the 7.5×54mm French round, that served the French for decades to come until France, along with the rest of NATO, adopted the standard NATO calibers, 5.56×45mm NATO and 7.62×51mm NATO.
Description
The obsolete 8mm Lebel round was powerful and accurate but due to its shape it was particularly poorly suited to automatic weapons with large-capacity magazines.[1] The only weapon ever fielded in 7.5 mm MAS mod. 1924 was the fusil-mitrailleur mle 1924, a light machinegun based on the B.A.R action. Early examples of the FM 24 proved prone to various failures; additionally, it was possible to mistake the new 7.5×57mm for a German 7.92×57mm Mauser round. The Mauser round would chamber and fire, but the larger bullet would not fit in the barrel and could cause a catastrophic malfunction. The new 7.5 mm round was abandoned and replaced by the 7.5×54mm MAS mod. 1929.[2]
See also
References
